JP2781472B2 - Double door opening and closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing a door which can be used for a refrigerator or the like.

[0002]

2. Description of the Related Art Conventional refrigerators and the like generally use one-sided doors, but recently, refrigerators and the like using doors that can be opened both right and left have been provided to the market in order to meet various needs of users. It is becoming. Conventionally, as such a double door opening / closing device, there is a device shown in FIGS. 10 to 15. As shown in FIG. 10, the opening / closing device includes upper mounting brackets 2a and 2b fixed to the front left and right ends of the refrigerator main body 1, and hinge pins 3a and 3b vertically protruding from the upper mounting brackets 2a and 2b, respectively. And lower mounting brackets 4a and 4b fixed to the refrigerator main body 1 at a position substantially lower than the upper mounting brackets 2a and 2b by the height of the door 8, and the lower mounting brackets 4a and 4b respectively move upward. Hinge pins 5a, 5b protruding from the upper part of the door 8 and the upper mounting brackets 2a, 2b.
An upper engaging member removably engaging with the hinge pins 3a, 3b projecting downward from the bottom, and is fixed inside the lower portion of the door 8, and is provided to project upward from the lower mounting brackets 4a, 4b. It is composed of hinge pins 5a and 5b and a lower engaging member which is detachably engaged. The upper portion of the door 8 is provided with engagement holes 6a and 6b for engaging with the hinge pins 3a and 3b, and the lower portion of the door 8 is provided with the hinge pin 5a.
Engaging holes 7a and 7b for engaging with a and 5b are provided.
The upper engaging member has a configuration shown in FIG. Since the lower engaging member has the same configuration, the upper engaging member will be described below, and the description of the lower engaging member will be omitted. This engaging member is provided with grooves 11a, 11 at both ends.
b, an engaging groove 1 for engaging the hinge pins 3a, 3b.
A fixed plate 10 to which members 13a and 13b having 2a and 12b are attached, and pivots 14a, 14b, 1
Members 23a, 23 attached to 5a, 15b, 16a, 16b and having engaging grooves 22a, 22b for engaging hinge pins 3a, 3b in fitting grooves 21a, 21b at both ends.
b is fixed to the fixed plate 20 and pivots 14a, 14b provided at both ends of the fixed plate 10 so that the hinge pins 3a, 3b are connected to the engaging grooves 12a (22).
a), 12b (22b) Latch groove 31 for restraining inside
a and 31b, and springs 32a and 32b for urging the latch plates 30a and 30b.
And a connecting mechanism 40 for connecting the two latch plates 30a and 30b, and safety devices 50a and 50b for restricting the rotation of the open latch plate when the door 8 is in the open state. The connecting mechanism 40 includes the pivots 15a, 15
swing links 41a, 41 which are swingably attached to b.
b and a connecting link 42 connecting the ends of the swing links 41a and 41b. Swing link 4
1a (41b) is a substantially L-shaped lock groove 44 composed of a slide guide portion 42a (42b) and a stopper portion 43a (43b).
a (44b), and the lock grooves 44a, 44b
Are lock pins 33 projecting from the latch plates 30a and 30b.
a, 33b to restrict the rotation of the latch plates 30a, 30b. Further, the safety device 50a,
50b includes safety plates 51a and 51b rotatably attached to the pivots 16a and 16b, and the safety plates 51a and 51b.
And springs 52a and 52b for urging the main body 1 toward the main body 1 side. The safety plate 50a
(50b) is a substantially L-shaped safety groove 54a (5) composed of a slide guide portion 52a (52b) and a stopper portion 53a (53b).
4b), and the safety grooves 54a, 54b are provided with safety pins 45a, 45b projecting from the swing links 41a, 41b.
And restricts the swing of the swing links 41a and 41b.

The operation of the switchgear having the above structure is shown in FIG.
This will be described with reference to FIG. FIG. 12 is a plan view showing a state in which the door is closed, and FIG. 13 is a plan view showing a state in which the door is opened. The left part of FIG. The portion is shown in (b). Now, FIG.
As shown in the figure, the latch plates 30a, 30b are hinged pins 3a,
From the state in which the door 3b is restrained, as shown in FIG.
Is opened in the direction of arrow A against the force of the spring 32b, the latch plate 30b rotates in the constraint release direction shown by arrow B, and the lock pin 33b of the latch plate 30b is locked by the lock groove of the swing link 41b. 44b is moved to the slide guide portion 42b, and the swing link 41b is swung in the direction of arrow C, whereby the safety pin 45b of the swing link 41b moves to the slide guide portion 52b of the safety groove 54b of the safety plate 51b. At the same time, the safety plate 51b is rotated in the direction of arrow D.
At this time, the movement of the swing link 41b is transmitted to the opposite swing link 41a by the connection link 42, the swing link 41a swings in the direction of arrow E, and the lock pin 33a of the latch plate 30a swings. The latch plate 30a is locked in the stopper portion 43a of the lock groove 44a so that the rotation of the latch plate 30a is restricted, so that the latch plate 30a does not rotate in the constraint release direction. Therefore, the door 8 does not come off from the main body 1 and the door 8 can be rotated about the hinge pin 3a. In addition, the swing of the swing link 41a causes the safety plate 51a to rotate around the pivot 16a in the direction of arrow F by the force of the spring 52a, and the swing link 4
The safety pin 45a of 1a is locked with the lock groove 54a of the
And the swing of the swing link 41a is restricted, so that the latch plate 30a does not rotate in the constraint release direction. Therefore, the open side latch plate 3
0b is subjected to a force in the restraining direction (the direction opposite to the arrow B) by some force, and the force is transmitted through the swing link 41b and the connection link 42 to swing the swing link 41a in the direction opposite to the arrow E. Also, since the swing is restricted by the safety device 50a, the swing link 41a does not swing, and therefore, the latch plate 30a does not rotate, and the door 8 is
Never get out of the way. In addition, the state of FIG.
When the left side is opened, the door 8 can be rotated about the hinge pin 3b without the door 8 coming off the main body 1 by the same operation as described above. When the door 8 is closed, the latch plates 30a and 30b shown in FIG. 12 are in a state of restraining the hinge pins 3a and 3b, respectively, by an operation reverse to that at the time of opening.

[0004]

When the conventional double door opening / closing device is used, when the door is opened, the safety plates 51a and 51b project from the door 8 toward the main body 1 as shown in FIG. Further, as shown in the enlarged view of FIG. 15, the latch plate 30a (30b) is inserted through the engagement hole 6a (6b) of the door 8.
Can be directly touched, but when the door is opened, children or the like mischief, and the safety plate 51b (5
1a) is pushed into the door 8 side, and at the same time, the engagement holes 6a (6b)
When the latch plate 30a (30b) is pressed and rotated with a finger or the like, the swing link 41b (41a) on the opposite side to the open side swings, and the latch plate 31a (31b) rotates in the constraint release direction, There is a problem that the constraint of the hinge pin 3b (3a) is released, and the door 8 easily falls off the main body and falls. The same can be said for the case where the lower engaging member is mischievous. As shown in FIG. 13, when the door 8 is open, the spring 32b (32a)
Since (30a) is urged in the direction of releasing the restraint, when closing the door 8, a force against this urging force is required, and there is a drawback that the door 8 is difficult to close. In addition, during the period from when the door 8 is opened to when it is completely closed, the spring 32 is used.
There is a point where the force for rotating the latch plate 30b (30a) of b (32a) becomes 0, and if the door 8 is stopped at that position, the door 8 stops halfway open. . Accordingly, an object of the present invention is to provide a double door opening and closing device that eliminates the above-described problems and disadvantages.

[0005]

In order to achieve the above object, a first aspect of the present invention is to provide a door or a body to which the door is attached, by attaching hinge pins to upper right and left ends and lower left and right ends. At the other end, a fixing plate having an engaging groove for removably engaging the hinge pin is provided on one of the other sides, and the left and right ends of the fixing plate are provided with latch grooves opened to the outer diameter side. A latch plate that is removably engaged with the hinge pin and urged by a spring to restrain the hinge pin in the engagement groove is rotatably mounted, and between the two latch plates, the release of one latch plate is released. A linking member for preventing rotation of the other latch plate in association with the rotation in the direction, the linking member being a pair of links pivotally attached to the fixed plate in the vicinity of the left and right latch plates, respectively; And a link formed by connecting one end of each link, and one of the latch plates or the links is provided with a substantially L-shaped lock groove formed of a slide guide portion and a stopper portion. A safety device that protrudes a lock pin that engages with the lock groove to restrict rotation of the latch plate on one of the other sides and that restricts rotation of the latch plate on the open side when the door is in an open state. The safety device is provided with a safety plate pivotally attached to the fixed plate near each of the left and right latch plates, and a spring for urging the safety plate to project toward the door or the main body side to which the hinge pin is attached. And a safety groove formed in a substantially L-shape including a slide guide portion and a stopper portion is provided in one of the links or the safety plates. A double-ended door opening and closing device comprising a safety pin projecting from the safety groove to restrict the swing of the link by engaging with the safety groove, wherein at least one of the upper left and right ends or the lower left and right both ends. One hinge pin protrudes downward, and the diameter of the tip of each hinge pin is larger than the width of the engagement groove.

According to a second aspect of the present invention, hinge pins protrude from left and right ends of one of a door and a body to which the door is attached, and the hinge pin is detachably engaged with one of the other. A fixing plate having an engaging groove is provided, and the left and right ends of the fixing plate are removably engaged with the hinge pin by latch grooves opened on the outer diameter side, respectively, and are urged by a spring to push the hinge pin. A latch plate to be restrained in the engagement groove is rotatably attached,
A connecting member is provided between the two latch plates to prevent rotation of the other latch plate in conjunction with rotation of one latch plate in the direction of releasing the restraint. And a connecting link for connecting one end of each of the links, and each of the latch plates or the links has a slide guide portion and a stopper portion. An opening and closing device for a double door, comprising a lock groove formed in an L-shape, and a lock pin for engaging with the lock groove and restricting rotation of the latch plate protrudingly provided on one of the other sides, The spring for urging the latch plate urges the latch plate in the restraining direction both when the door is opened and when the door is closed. A locking device for restricting rotation of the latch plate on the side. The locking device includes a locking member pivotally attached to the fixing plate in the vicinity of each of the left and right latch plates, and a locking member for connecting the locking member to the engagement groove. And a spring that urges in the direction
A protrusion is provided on one of the links or the latch plates, and a locking portion for locking the protrusion when the door is opened is provided on the locking member, and the tip of the hinge pin is latched with the latch. The groove is made thicker than the latch engaging portion to be engaged, and when the door is closed, the locking member is pushed by the tip of the hinge pin, the locking portion is disengaged from the projection, and the latch plate rotates. The feature is that the restrictions are lifted.

[0007]

In the first aspect of the invention, when the door is opened,
The safety plate protrudes toward the door or the main unit, and can directly touch the latch plate from the outside.When the door is opened, the child etc. mischiefs and pushes the closed side safety plate into the door or the main unit. At the same time, when the latch plate on the open side is pressed and rotated with a finger or the like, the swinging link on the closed side swings, and the latch plate on the closed side rotates in the restraint releasing direction, releases the restraint of the hinge pin, and opens the door. Is easily detached from the main body at the hinge pin, but even if the door is disengaged from the main body at the hinge pin, the diameter of the tip of the hinge pin at the fulcrum side opposite to the point where the door comes off is opposite to the fixed plate. Since the width is larger than the width of the mating groove, the hinge pin is not caught by the engaging groove of the fixing plate, so that the door does not come off from the main body and the door can be prevented from dropping.

In the second aspect of the present invention, when the door is open, both the open side and the closed side latch plates are urged in the restraining direction by a spring, and the open side locking member is engaged. The stopper locks a protrusion provided on either the link on the open side or the latch plate, and regulates the rotation of the latch plate. Next, when the door is pushed in the closing direction, before the latch engaging portion of the open hinge pin pushes the open latch plate, first, the tip end of the hinge pin is engaged with the open side locking member. The locking member is rotated by contact. Then, the locking portion of the locking member is disengaged from the protrusion, and the latch plate on the open side can rotate in the restraining direction. When the door is further pushed, the latch plate on the open side rotates in the restraining direction, and the latch groove of the latch plate holds the latch engaging portion of the hinge pin, and a spring for urging the latch plate in the restraining direction. The door automatically closes without pressing the door. Therefore, a large force is not required to close the door, and the door does not stop halfway open.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. Embodiment of the First Invention FIGS. 1 to 5 show a double door opening / closing device according to this embodiment.
This switching device is a hinge pin 3a of the conventional switching device.
Instead of using the hinge pin 300a whose tip portion 302a is thicker than the latch engagement portion 301a,
In addition, instead of the engaging hole 6a, an engaging hole 600a for engaging the hinge pin 300a is provided.
Instead of the member 13a, although not shown, a member having an engagement groove capable of engaging the tip end portion 302a of the hinge pin 300a is attached, and the structure of the other hinge pins and their engagement portions is the same as described above. The other configuration is the same as that of the above-mentioned conventional switchgear. The same components are denoted by the same reference numerals and description thereof will be omitted. In the state where the door 8 is closed, as shown in FIG.
The latch engaging portions 301a and 301b of 300b are restrained by the latch grooves 31a and 31b of the latch plates 30a and 30b, respectively, and are engaged with the engaging grooves 22a and 22b. Tip portions 302a, 302b of the hinge pins 300a, 300b
Are larger than the groove widths of the engagement grooves 22a and 22b, respectively. The same is true for the lower part of the door. In this state, when the right side of the door 8 is opened in the direction of arrow A as shown in FIG. 3, the latch plate 30b is rotated in the direction of releasing the constraint indicated by arrow B as described in the conventional example, and the swing link is rotated. 41b, the safety plates 51b and 51a, and the oscillating link 41a move in the directions of the arrows, respectively.
The lock pin 33a of the lock plate 0a fits into the stopper 43a of the lock groove 44a of the swing link 41a, and the latch plate 3
As a result, the door 8 does not rotate in the constraint release direction, and the door 8 rotates around the hinge pin 300a without coming off the main body 1. Also, the safety plate 51a rotates in the direction of arrow F, and the safety pin 45a fits into the stopper 53a,
The swing of the swing link 41a is restricted, so that the latch plate 30a does not rotate in the constraint release direction. When the door is opened, a child or the like mischiefs and closes the safety plate 51 on the closed side.
a of the safety pin 45a into the stopper 5
3a and simultaneously release the latch plate 30 on the open side with a finger or the like.
b to rotate the swing link 41b and the safety plate 5
1b rotates in the directions opposite to the arrows C and D, respectively, the connecting link 42 is pushed toward the closing side, and the swing link 41a
And the latch plate 30a is
Release the constraint of 0a. Therefore, the door 8 is connected to the hinge pin 3
00a easily comes off the body 1 at the time,
Even if the upper part of the door 8 is disengaged from the main body 1, the diameter of the distal end portion 502 a of the hinge pin 500 a is attached to the fixed plate 20 at the fulcrum side opposite to the disengagement, that is, at the hinge pin 500 a thereunder. Door 23 is larger than the width of the engagement groove 22a of the member 23a.
Is locked by the hinge pin 500a and does not come off the main body 5, so that the door 8 does not fall. Further, even if the lower portion of the door 8 is disengaged from the main body 1, the door 8 is supported by the upper hinge pin, so that the door 8 does not fall. Therefore, the child is safe without being injured.

[0010] A switchgear casement doors of this embodiment from the embodiment 6 of the second aspect of the invention in FIG.
The structure of the hinge pin and the engaging portion of the hinge pin of this opening / closing device is the same as that of the first embodiment. Also,
The configuration of the engagement member is as shown in FIG. This engaging member is different from the conventional example shown in FIG. 11 in the following points. That is, the springs 32a, 32b for urging the latch plates 30a, 30b urge in the restraining direction when closed and urge in the constraint releasing direction when opened in the conventional example. On the other hand, in this embodiment, as shown in FIG. 7, both the closing and the opening are urged in the restraining direction. Then, the latch plate 30
a, 30b are provided with projections 34a, 34b,
The locking device 400a, which locks the protruding portions 34a, 34b at the time of opening, and restricts the rotation of the latch plates 30a, 30b.
400b are provided. The locking device 400a is rotatably attached to the pivot 17a of the fixed plate 10 near the latch plate 30a, and locks the protrusion 34a.
01a and the locking member 40a
2a and a spring 403a for urging the engagement groove 2a toward the engagement groove 22a. Similarly, the locking device 400b also includes a locking member 402b having a locking portion 401b and a spring 403b. Other configurations are the same as those of the above-described conventional switchgear, and the same components are denoted by the same reference numerals and description thereof will be omitted. The opening and closing device has the same safety device as the safety devices 50a and 50b in the conventional example, but the description is omitted. The operation of the switchgear having the above configuration will be described with reference to FIGS. In the open state of the door 8 shown in FIG. 7, the closed side and the open side latch plates 30a,
30b are both urged in the restraining direction by the springs 32a and 32b, and the locking member 402 on the open side.
The locking portion 401b of FIG. 3b locks the projection 34b of the latch plate 30b, thereby restricting the rotation of the latch plate 30b. When the door 8 is closed from this state, as shown in FIG. 8, the locking member 402b is pushed by the distal end portion 302b of the hinge pin 300b, and the locking portion 401b is disengaged from the protrusion 34b, and the latch plate 30b is released. Can be rotated in the constraint direction.
When the door 8 is further pushed, the latch plate 30b rotates in the restraining direction by the force of the spring 32b, and the latch groove 31
b holds the latch engagement portion 301b of the hinge pin 300b, so that the door 8 automatically closes without pressing the door 8. FIG. 9 shows the closed state, in which the latch plate 30 is closed.
A and 30b are urged in the restraining direction by springs 32a and 32b, respectively, and restrain the hinge pins 300a and 300b. Further, the locking members 402a, 402b
Are urged toward the engagement grooves 22a and 22b by springs 403a and 403b, respectively.
a, 401b are locked to the projections 34a, 34b, so that when the door 8 is opened, the locking members 402a, 402b are connected to the tips 302a, 302b of the hinge pins 300a, 300b.
And the door 8 can be easily opened. As described above, the springs 32a, 32b always urge the latch plates 30a, 30b toward the restraining side not only when the latch plates 30a, 30b are opened but also when the latch plates 30a, 30b are opened.
When closing the door, only a small force is required, and the door 8 is not half open. Further, similarly to the embodiment of the first invention, the distal ends 3 of the hinge pins 300a and 300b are provided.
Since the diameters of 02a and 302b are larger than the widths of the engagement grooves 22a and 22b, the door 8 does not fall off the main body 1 due to mischief of a child or the like.

In both the first and second embodiments, the hinge pin is provided on the main body and the engaging member is provided on the door side. However, the hinge pin is provided on the door side and the engaging member is provided on the main body. It may be provided on the side.

[0012]

As is apparent from the above description, the double door opening and closing device according to the first aspect of the present invention is provided at the upper left and right ends and the lower left and right ends of one of the door and the body to which the door is attached. A hinge pin is protruded, and at least one of the upper left and right ends or the lower left and right ends is protruded downward, and the diameter of the tip of each hinge pin is set to the door or body. Since the width of the engaging groove provided on each of the right and left ends of the fixing plate fixed to one of the other is larger than the width of the engaging groove for engaging the hinge pin, the hinge pin is restrained in the engaging groove when the door is opened. Even if the restraint of the latch plate and the restriction by the safety device that restricts the rotation of the latch plate are released by mischief by a child or the like, and the door is disengaged from the main body on the release side, the release side and the release In the engagement portion on the opposite side, without hinge pin is disengaged from the engaging groove, therefore, without the door falling from the body, it is very safe.

The double door opening / closing device of the second invention is characterized in that hinge pins protruding from left and right ends of one of the door and the main body to which the door is attached are attached to the other of the door and the main body. A spring for urging the latch plate to be held in the engagement grooves provided at both right and left ends of the fixed fixing plate holds the latch plate in the restraining direction regardless of whether the door is opened or closed. And a locking device for restricting rotation of the latch plate on the open side when the door is in an open state, wherein the locking device is provided near each of the left and right latch plates. A locking member pivotally attached to the fixed plate and a spring for urging the locking member in the direction of the engagement groove, and a projection is provided on one of the links or the latch plates. ,
The locking member is provided with a locking portion for locking the protruding portion when the door is opened, and the tip of the hinge pin is made thicker than a latch engaging portion with which the latch groove is engaged, thereby closing the door. Sometimes, the locking member is pushed by the tip of the hinge pin, and the locking portion is disengaged from the projection to release the restriction on the rotation of the latch plate. In addition, the door does not stop when the door is half-open.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an attached state of a door according to an embodiment of the first invention.

FIG. 2 is a plan view showing a closed state of a door in the embodiment.

FIG. 3 is a plan view showing an open state of a door in the embodiment.

FIG. 4 is a front view of a hinge pin in the embodiment.

FIG. 5 is a front view showing an engagement portion with a hinge pin in the embodiment.

FIG. 6 is an exploded perspective view of an engagement member according to one embodiment of the second invention.

FIG. 7 is a plan view showing an open state of a door in the embodiment.

FIG. 8 is a plan view showing an intermediate state when the door is closed in the embodiment.

FIG. 9 is a plan view showing a closed state of the door in the embodiment.

FIG. 10 is a perspective view showing an attached state of a door in a conventional example.

FIG. 11 is an exploded perspective view of the engagement member of the conventional example.

FIG. 12 is a plan view showing a closed state of a door in the conventional example.

FIG. 13 is a plan view showing an open state of a door in the conventional example.

FIG. 14 is a front view of a hinge pin in the conventional example.

FIG. 15 is a front view showing an engagement portion with a hinge pin in the conventional example.

[Explanation of symbols]

1 ... refrigerator body, 8 ... door, 10, 20 ... fixing plate, 22a,
22b: engagement groove, 30a, 30b: latch plate, 31a, 3
1b: latch groove, 32a, 32b: spring, 34a,
34b ... projecting part, 41a, 41b ... link, 42 ... connecting link, 51a, 51b ... safety plate, 52a, 52b ... spring, 300a, 300b ... hinge pin, 301a, 3
01b: Latch engaging portion, 302a, 302b: Tip portion,
400a, 400b: locking device, 401a, 401b: locking part, 402a, 402b: locking member, 403a, 403
b: spring, 600a, 600b: engagement hole.

Claims (2)

(57) [Claims] 1. A hinge pin protrudes from one of upper and lower left and right ends of one of a door and a body to which the door is attached, and the hinge pin is detachably attached to one of the other. A fixing plate having an engaging groove to be engaged is provided, and the left and right ends of the fixing plate are releasably engaged with the hinge pin by latch grooves opened to the outer diameter side, and are urged by a spring to bias the hinge pin. A latch plate for restraining the hinge pin in the engaging groove is rotatably mounted, and a connection between the two latch plates for preventing rotation of the other latch plate in conjunction with rotation of one of the latch plates in the release direction. The connecting member comprises a pair of links pivotally attached to the fixed plate in the vicinity of the left and right latch plates, and a connecting link connecting one end of these links. A substantially L including a slide guide portion and a stopper portion on either one of the latch plates or the links described above.
A lock groove formed in the shape of a letter is provided, and a lock pin that engages with the lock groove and regulates rotation of the latch plate is protrudingly provided on one of the other, and the open side is opened when the door is open. A safety device for restricting rotation of the latch plate is provided. The safety device includes a safety plate pivotally attached to the fixed plate in the vicinity of each of the left and right latch plates, and the door to which the safety plate is attached with the hinge pin. Or a spring that urges to protrude toward the main body side, and a safety groove formed in a substantially L-shape comprising a slide guide portion and a stopper portion is provided in one of the links or the safety plates. A double-ended door opening / closing device having a safety pin projecting on one of the other to engage with the safety groove and restrict swinging of the link, wherein the upper left and right ends or the lower side are provided. A double door opening / closing device, wherein at least one hinge pin at both left and right ends protrudes downward, and a diameter of a tip end of each hinge pin is larger than a width of the engagement groove. 2. A hinge having a hinge pin protruding from one of left and right ends of one of a door and a body to which the door is attached, and having an engaging groove on one of the other to engage the hinge pin in a detachable manner. A plate is provided, and the left and right ends of the fixed plate are removably engaged with the hinge pin by latch grooves opened to the outer diameter side, and are urged by a spring to restrain the hinge pin in the engagement groove. And a connecting member is provided between the two latch plates to prevent rotation of the other latch plate in conjunction with rotation of one of the latch plates in the release direction. A pair of links pivotally attached to the fixed plate in the vicinity of the left and right latch plates, and a connecting link connecting one end of each of the links; A lock groove formed in a substantially L-shape including a slide guide portion and a stopper portion is provided on one of the lock grooves, and a lock pin that engages with the lock groove and restricts rotation of the latch plate is provided on one of the lock grooves. A double door opening / closing device that is provided in a protruding manner, wherein a spring for urging the latch plate urges the latch plate in a restraining direction regardless of whether the door is opened or closed. A locking device for restricting rotation of the latch plate on the open side when the door is in an open state, wherein the locking device is pivotally attached to the fixed plate in the vicinity of the left and right latch plates. A stop member and a spring for urging the lock member in the direction of the engagement groove, a projection is provided on one of the links or the latch plates, and the door is provided on the lock member. When the A locking portion for locking the raised portion is provided, the tip of the hinge pin is made thicker than the latch engaging portion with which the latch groove is engaged, and when the door is closed, the locking member is connected to the tip of the hinge pin. Wherein the locking portion is disengaged from the protruding portion to release the restriction on the rotation of the latch plate.